AN 669: Drive-On-Chip Design Example for Cyclone V Devices

ID 683466
Date 5/15/2022
Public
Document Table of Contents

BiSS Encoder Interface

The reference design uses an evaluation of the BiSS Master IP core version 119 from iC-Haus to read from the BiSS absolute position encoder attached to the motor. The reference design configures the BiSS IP core to respond to the trigger output that the PWM generates and reads a new position value. The BiSS IP core can communicate with any device complying with the BiSS standard. However, Intel configures the reference design to work with the Hengstler AD36 series of BiSS B encoders.

The ip\biss_OCP directory includes the datasheet for the BiSS Master IP core.

The BiSS IP core requires a strobe to capture a position reading at a time synchronized with the ADC interface. The reference design generates the BiSS strobe at the exact reversal point of the PWM without offset.

Note: The reference design connects the strobe signal between the BiSS and PWM in the top level Verilog HDL design, not in the Qsys system.